Furnace.



No. 818,588. PATENTBD APB.. Z4, 1906,. H. WEBSTER.

PURNAGE. V

APPLIOATION FILED oo'r. 2,1900.`

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HOSEA WEBSTER, OF MONTCLAIR, NElY JERSEY.

FURNACE.

Specicaton of Letters Patent.

Patented April 24, 1906.

Application filed October. 1905. Serial No. 280.9251

.New lJersey, have inventedcertain new and useful Improvements in Furnaces, of which the lfollowing is a specification, reference being had therein to the accompanying drawings.l

rlhis invention relates to furnaces for burning solid fuel, and is embodied for illustration in a furnace adapted for steam-boilers.

Figure l of the drawings is a side elevation?, partly in section, and Fig. 2, a transverse ver"- tical section of the furnace-cl'iainber on the line Fig. l.

The drawings represent a type of land boiler containing horizontal inclined watertubes 1, a longitudinal steam and `water drum connected through headers 2 3 and circulating-pipes 4 5, with the horizontal steam and water drum 6 the heated gases being coinpelledjto make a plurality of passes through and among the tubes by,the transverse baf- Afles 7 S and passing thence through a dow-ntake 9 to an opening Q at the base of the boiler-setting Yconnected with the chimney. ln this class of boilers the location of the bafles 7 and S is conventionally such as to apportion the length of the tubes between the three passes a, b, and c in such manner as experience has shown tov be most etlicient, and it has also been customaryl lto locate the bridge-wall bounding the hre at the rear substantially beneath -the deilector 7, which separates the first and second passes, or, in other words, so that the front of the bridgewall was substantially in the position of the dotted line ar.

The object of my inventionis while retaining the general features of the boiler above referred to to obtain greater capacity whereby low grades of" fuel may be burned, if desired, and a thorough and complete combustion may be eil'i'fcted. l

The various features of my invention will appear from the following description and the appended claims.

Bridge-wall 10, bounding the rear ofY the furnace-chamber, is set back from the ordi-A nary position (indicated by the dotted line fr) to substantially the position shown in thc drawings, andthe top of it is connected by the rooill, of {1re-brick7 to the bottoinof the dehector?. Thus in addition to the ordinary tire-bea: al (footed by the water-tubes nl' the first pass a) l provide a fire-box extension separatediroin the second pss b by the roof 11 and closed atits rear end' by the wall 10.

v The gases formed in the fire-box extension e beneath the second pass b can onlyT 'reach 'said second pass through the first pass a.

They are thus compelled to pass forward (counter-current) to the direction of thc airshaft beneathA the grate and are held down by the roof 11 close to the fiiel of the grate on their way to the tire-box proper, d, wherein they join' the gases coming upward from the fuel in the fire-box proper, wherein the combined gases of the lire-box proper and tirebox extension are cquably applied to lthe |area of the tubes in the first pass.

In the forni shown both the roof 10 and thegrate 13 are upwardly'inclined from the reai toward the front 12, and the grate shown is ofthe shaking type with a dumping section at its inner end. 'lhcse features combine to `increase the eihciency of die [irc-box extension e because the inclination of the grate and the agitation'of the coal produced by movenient thereof constitute a rearwar(ily-feeding' grate and tend-to causerthc fuel-to settle toward the rear of the fire-box extension and compelled to travel forward over the bed of fuel, as above described. also the roof 11 is inade in the form of an arch, so that its reverberating effect will be brought to bear upon'the gases in their passaqr ward beneath such roof. The upward` nation of the roof 11 and the water-tubes from the rear to the front being at a greater angle than the upward iinclin'ation of the grate 13, the combustioli-chamber above the In the forni shown grate gradually enlarges, so as to pcrmitof the expansion of the gases in their passage toward the first pass through the tubesl l claim as my invention-- 1. In combination with a steam-boiler-of the horizontal inclined water-tube type hav-y ing a plurality ot passes for tlic gases through thc tubes and a lire-box rnoicd by thc tubes of the [irst pass, a rearward extension of said 'fire-box beneath the second pass, a grate cxtending through said tire-box and said extension aroot separating said extension lroin said second boiler-pass, anda'wall closing ii'ga plurality'of passes for the gases through the tubes and a rire-,box roofed by tlie'tubes of the h rst pass, a rearward extension of said- IOO l fire-box beneath the second. pass, a rearsaid downtake; a y.roof extendi Vf'oiwardly wardly-eeding grate extending through said from the-topjof said'. bdgeLwall to the diret.

iile-bo'x and said extension and a roof sepapass, and a grate extending from the front oi i 5 rating said extension from seid second boileithe boiler to said bridg'efwall thl'ou hout the 5 passi l y space 'oofed-by the tubes of the st pass, y 3. n combination with a steam-boiler of and'said roof.y v

the horizontal inclined water-tube 'type hav- In testimonywhereof I a'lixfmy signature ing a plurality of passes for the ases throu'vh in presence of two Witnesses! the tubes and a dowiitake at t e rear of t e I i HOSEA WEBS'IER. 1o boiler and a fire-box roofed by the tubes in' `Witnesses1 v. A y

the iii-st pass', of a bridge-Wall locatednbe- CEAS. W` FQBES,

tweenthe medial line'oi said water-tubes and KATHERINE FQLTMER. 

